1、May 2007DEUTSCHE NORM English price group 8No part of this standard may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 83.080.20!,xa*“9856207www.d
2、in.deDDIN EN ISO 1265Plastics Poly(vinyl chloride) resins Determination of number of impurities and foreign particles(ISO 1265:2007)English version of DIN EN ISO 1265:2007-05Kunststoffe Vinylchlorid-Polymerisate Bestimmung der Anzahl von Verunreinigungen und Fremdpartikeln (ISO 1265:2007)Englische F
3、assung DIN EN ISO 1265:2007-05SupersedesDIN EN ISO 1265:1997-12www.beuth.deDocument comprises 12 pages 08.07DIN EN ISO 1265:2007-05 2 National foreword This standard has been prepared by Technical Committee ISO/TC 61 “Plastics” in collaboration with Technical Committee CEN/TC 249 “Plastics”, the Sec
4、retariat of which is held by IBN (Belgium). The responsible German body involved in its preparation was the Normenausschuss Kunststoffe (Plastics Standards Committee), Technical Committee NA 054-02-05 AA PVC-Formmassen. Amendments This standard differs from DIN EN ISO 1265:1997-12 as follows: a) The
5、 standard has been completely revised. b) More precise requirements for the test procedure and the expression of results have been specified. c) An informative Annex A showing a flow diagram of the method has been included. Previous editions DIN EN ISO 1265: 1997-12 EUROPEAN STANDARD NORME EUROPENNE
6、 EUROPISCHE NORM EN ISO 1265 February 2007 ICS 83.080.20 English Version Plastics - Poly(vinyl chloride) resins - Determination of number of impurities and foreign particles (ISO 1265:2007) Plastiques - Rsines de poly(chlorure de vinyle) - Dtermination du nombre dimpurets et de corps trangers (ISO 1
7、265:2007) Kunststoffe - Vinylchlorid-Polymerisate - Bestimmung der Anzahl von Verunreinigungen und Fremdpartikeln (ISO 1265:2007) This European Standard was approved by CEN on 29 December 2006. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions f
8、or giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member. This European Standard exists in three offic
9、ial versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria,
10、 Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTE
11、E FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2007 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 1265:2007: EForeword 2 EN ISO 1265:
12、2007 (E)This document (EN ISO 1265:2007) has been prepared by Technical Committee ISO/TC 61 “Plastics” in collaboration with Technical Committee CEN/TC 249 “Plastics”, the secretariat of which is held by IBN/BIN. This European Standard shall be given the status of a national standard, either by publ
13、ication of an identical text or by endorsement, at the latest by August 2007, and conflicting national standards shall be withdrawn at the latest by August 2007. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement
14、this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and U
15、nited Kingdom. Endorsement notice The text of ISO 1265:2007 has been approved by CEN as EN ISO 1265:2007 without any modifications. Introduction Poly(vinyl chloride) resins are commonly produced as various powders that are essentially white in colour. However, the polymerization of vinyl chloride mo
16、nomer into poly(vinyl chloride) uses processes that may cause some particulate impurities to be included in the powders because of the design of the construction plant and the use of heat. This International Standard describes a simple procedure for determining the number of impurities and foreign p
17、articles in a sample, with clarification of the different cases encountered (highly contaminated, heterogeneous or homogeneous contamination of the sample). 3 EN ISO 1265:2007 (E)1 Scope This International Standard specifies a method for determining the number of impurities and foreign particles in
18、a flattened surface of poly(vinyl chloride) resin. It is not applicable to paste resins because of their finely divided state. 2 Principle A certain quantity of resin is flattened between a rigid plate (covered with a sheet of glazed white paper) and a glass plate containing a grid, and the number o
19、f specks (impurities and foreign particles) of size greater than 0,250 mm, i.e. clearly visible to the naked eye, is counted in 25 squares of the grid. The result is expressed, by extrapolation, as the number of specks per 100 squares of the grid. 3 Apparatus 3.1 Glass plate, 340 mm 340 mm 4,5 mm, c
20、olourless, perfectly transparent, and without defects such as stripes, bubbles or black spots.1)Mark in the centre of the surface of the glass sheet a grid measuring 300 mm 300 mm, consisting of 100 30 mm 30 mm squares. This grid may be drawn with an indelible pencil, a diamond or any other appropri
21、ate tool, on the face of the sheet which is not in contact with the resin. 3.2 Rigid plate, 450 mm 450 mm, covered with a sheet of glazed white paper. 3.3 Timer (e.g. stopwatch). 4 Procedure Spread out about 200 cm3of the test sample on the rigid plate (3.2). Place the glass plate (3.1) on the test
22、sample and, by slight movements of the plate, spread the sample so that it touches the glass over an area of at least 25 squares, preferably in the centre of the plate. Mark the limits of the entire 25 selected squares with a thick pencil mark (see Figure 1). Count the number, n1, of coloured and bl
23、ack “specks” (impurities and foreign particles) visible to the naked eye inside the selected squares, within a period of 2 min. The selected squares shall be viewed from a distance of about 300 mm in good laboratory lighting conditions. 1) If there are any defects in the glass plate, take this into
24、account in the determination. 4 EN ISO 1265:2007 (E)NOTE 1 2 min is the maximum time before the operators eyes become tired. NOTE 2 A photographic reference scale is provided to indicate which particles are to be counted (see Figure 2). Repeat the counting process (giving counts of n2, n3, n4) as ne
25、cessary, using a new test sample each time, according to the following schedule: a) First determination (count n1) If there are too many specks inside the 25 squares to count within 2 min, the number of squares examined, S, shall be noted in addition to the number of specks counted, n1, and no furth
26、er samples shall be tested. If it is possible to count all the specks in the 25 squares within 2 min, carry out a second determination on a fresh test sample. b) Second determination (count n2) If, in the second determination, there are too many specks inside the 25 squares to count within 2 min, th
27、e number of squares examined, S, shall be noted in addition to the number of specks counted, n2, and no further samples shall be tested. If n1 n2 3, the contamination is considered to be homogeneous and no further samples shall be tested. If n1 n2W 3, the contamination is considered to be heterogene
28、ous and a third determination shall be carried out on a fresh test sample. c) Third determination (count n3) If, in the third determination, there are too many specks inside the 25 squares to count within 2 min, the number of squares examined, S, shall be noted in addition to the number of specks co
29、unted, n3, and no further samples shall be tested. If it is possible to count all the specks in the 25 squares within 2 min, carry out a fourth determination on a fresh test sample. d) Fourth determination (count n4) If, in the fourth determination, there are too many specks inside the 25 squares to
30、 count within 2 min, the number of squares examined, S, shall be noted in addition to the number of specks counted, n4. A flow diagram showing the above procedure is included as Annex A. 5 Expression of results The number of specks per 100 squares, P, shall be expressed in accordance with the experi
31、mental schedule described in Clause 4 (see also Annex A). If, in any of the determinations, th ere were too many specks inside the 25 squares to count within 2 min, the resin is highly contaminated and the number of specks per 100 squares, P, shall be calculated from the equation: P = (n 100)/S 5 EN
32、 ISO 1265:2007 (E)where n = n1, n2, n3or n4; S is the number of squares examined. If two determinations were made and n1 n2 3, the contamination of the resin is homogeneous and the number of specks per 100 squares, P, shall be calculated from the equation: P = 2(n1+ n2) If four determinations were m
33、ade, the contamination of the resin is heterogeneous and the number of specks per 100 squares, P, shall be calculated from the equation: P = n1+ n2+ n3+ n46 Test report The test report shall include the following information: a) all details necessary for complete identification of the product tested
34、; b) a reference to this International Standard; c) the result, expressed in accordance with Clause 5; d) any unusual features noted during the determination; e) the date of the test. 6 EN ISO 1265:2007 (E)Dimensions in millimetres Key 1 glass sheet 2 rigid plate 3 sheet of glazed white paper 4 resi
35、n Broad hatching: area of contact between glass plate and resin. Close hatching: group of 25 squares chosen for the count. Figure 1 Method of spreading the resin on the glass plate to count the impurities and foreign particles 7 EN ISO 1265:2007 (E)Figure 2 Photographic reference scale 8 EN ISO 1265:2007 (E)Annex A (informative) Flow diagram for counting the number of specks (impurities and foreign particles) and expression of results 9 EN ISO 1265:2007 (E)10 EN ISO 1265:2007 (E)
